Adult Congenital Heart Disease - part 5 potx

106 Chapter 13 tricle to the pulmonary artery. By virtue of this procedure, the left ventricle supports the systemic circulation. Late complications • Following atrial switch procedure, one of the following complications may occur: – signifi cant systemic (tricuspid) atrioventricular (AV) valve regurgitation (40%); – systemic right ventricular dysfunction (40%); – symptomatic bradycardia (sinus node dysfunction, AV node block) (50%) – atrial fl utter and fi brillation (20% by age 20); – superior or inferior vena cava pathway obstruction; – pulmonary venous obstruction (rare); – atrial baffl e leak. • Following arterial switch procedure, the following complications may occur: – right ventricular outfl ow tract obstruction; – neo-aortic valve regurgitation; – myocardial ischemia from coronary artery obstruction. • Following the Rastelli procedure, the following complications may occur: – right ventricle-to-pulmonary artery conduit stenosis; – signifi cant subaortic obstruction (across LV–aorta tunnel); – residual VSD. Recommended follow-up Regular follow-up by physicians with special expertise in adult congenital heart disease is recommended. • Atrial switch: serial follow-up of systemic right ventricular function is war- ranted. Echocardiography and RNA can be used, although MRI is especially useful. • Arterial switch: regular follow-up with echocardiography is recommended. • Rastelli: regular follow-up with echocardiography is warranted given the inevitability of conduit degeneration over time. • Holter monitoring is recommended to diagnose unacceptable brady- or tachyarrhythmias. Endocarditis recommendations • All patients with DTGA status after atrial switch or Rastelli procedure should take SBE prophylaxis for life. • Patients with DTGA status after arterial switch should take SBE prophylaxis if any residual hemodynamic disturbances are present (mild pulmonary ste- nosis, aortic regurgitation, etc.). Exercise • In the absence of severe cardiomegaly or severe pulmonary hypertension, patients should be restricted to class 1A type activities (see Chapter 6). Complete Transposition of the Great Arteries 107 • Patients with severe cardiomegaly or severe pulmonary hypertension should not exercise. Pregnancy and contraception Pregnancy in women with a normal functional class following atrial switch operation is usually well tolerated. Worsening of systemic right ventricular function during or shortly after pregnancy, however, has been reported. ACE inhibitors should be stopped before pregnancy occurs. Long-term outcome • Atrial switch – Following atrial baffl e surgery, most patients reaching adulthood will be in NYHA class I–II. – Progressive systemic right ventricular dysfunction and left AV valve re- gurgitation is the rule. – About 10% of patients will present with frank symptoms of congestive heart failure. – Atrial fl utter/fi brillation occurs in 20% of patients by age 20. – Progressive sinus node dysfunction is seen in half of the patients by early adulthood. • Arterial switch – Supravalvar pulmonary stenosis. – Ostial coronary artery disease. – Progressive neo-aortic valve regurgitation. • Rastelli procedure – Progressive right ventricular to pulmonary artery conduit obstruction can cause exercise intolerance or right ventricular angina. – Left ventricular tunnel obstruction can present as dyspnea or syncope. Key clinical points • Patients with an atrial switch procedure and severe systemic (tricuspid) AV valve regurgitation may need: – valve replacement if systemic ventricular function is adequate; – consideration of heart transplantation; – a conversion procedure to an arterial switch following retraining of the left ventricle with a pulmonary artery band. • Following an atrial switch procedure, atrial tachyarrhythmias and/or brady- cardia commonly develop in early adulthood. Corrected Transposition of the Great Arteries Description of the lesion In congenitally corrected transposition of the great arteries (L-TGA or CCTGA), the connections of both the atria to ventricles and of the ventricles to the great arteries are discordant. Systemic venous blood passes from the right atrium 108 Chapter 13 through a mitral valve to the left ventricle and then to the right-sided posteri- orly located pulmonary artery. Pulmonary venous blood passes from the left atrium through a tricuspid valve to the right ventricle and then to an anterior, left-sided aorta (see Fig. 13.1). The circulation is thus ‘physiologically’ correct- ed, but the morphologic right ventricle supports the systemic circulation. Associated anomalies occur in up to 98% and include: • VSD (~75%); • pulmonary or subpulmonary stenosis (~75%); • left-sided (tricuspid and often ‘Ebstein-like’) valve anomalies (>75%); • complete AV block (~2% per year). Incidence and etiology Congenitally corrected transposition of the great arteries is a rare condition, accounting for less than 1% of all congenital heart disease. Presentation and course in childhood Patients with no associated defects (~1% of all such patients) are acyanotic and often asymptomatic until late adulthood. Dyspnea and exercise intolerance from systemic ventricular failure and signifi cant left AV valve regurgitation will usually manifest itself by the fourth or fi fth decade, and palpitations from supraventricular arrhythmias may arise in the fi fth or sixth decade. Patients with a VSD and pulmonary outfl ow tract obstruction will either present in congestive heart failure (if VSD large) or cyanosed (if RVOTO se- vere) and will undergo classic repair (VSD patch closure with RVOT relief of obstruction) or double switch operation (atrial and arterial switch procedure) early on. Signifi cant left AV valve regurgitation is rarely seen in childhood and is more likely to arise later on or after classic repair type surgery. Physical examination • A single loud S 2 (A 2 ) will be heard, P 2 being silent due to its posterior location. The murmur of an associated VSD or left atrioventricular valve regurgitation may be heard. The murmur of pulmonary stenosis will radiate upward and to the right, given the rightward direction of the main pulmonary artery. • If complete heart block is present, cannon A waves with an S 1 of variable inten- sity will be present. Useful investigations • EKG: complete atrioventricular block can be present. The presence of Q wave in leads V 1–2 combined with an absent Q wave in leads V 5–6 is typical and refl ects the initial right-to-left septal depolarization occurring in the setting of ‘ventricular inversion’. This should not be mistaken for evidence of previous anterior myocardial infarction. • Chest radiography: because of the unusual position of the great vessels (pulmonary artery to the right and aorta to the left), the pulmonary trunk is Complete Transposition of the Great Arteries 109 inconspicuous and an abnormal bulge along the left side of the cardiac contour refl ects the left-sided ascending aorta rising to the aortic knuckle. Surgical management • Classic repair: this procedure consists of VSD patch closure, left ventricular to pulmonary artery valved conduit insertion and systemic tricuspid valve re- placement. Patients having undergone ‘classic’ repair continue to have a mor- phologic right ventricle supporting the systemic circulation. • Double switch operation: This procedure consist of an atrial switch procedure (Mustard or Senning) together with an arterial switch procedure. It should be considered for patients with severe tricuspid regurgitation and systemic ven- tricular dysfunction. Its purpose is to relocate the left ventricle into the system- ic circulation and the right ventricle into the pulmonary circulation, achieving ‘anatomic’ correction. Firstly, the LV must be appropriately ‘trained’. • Complete AV block may require pacemaker implantation for symptoms, pro- gressive or profound bradycardia, poor exercise heart rate response or cardiac enlargement. Late complications Natural history after ‘classic’ repair: • progressive systemic (tricuspid) AV valve regurgitation; • progressive systemic (right) ventricular dysfunction; • atrial arrhythmias; • acquired complete atrioventricular block continues to develop at 2% per year, and is especially common at the time of heart surgery (25%); • subpulmonary (morphologic left) ventricular dysfunction. Recommended follow-up All patients should have at least annual cardiology follow-up with an expert in the care of adult patients with congenital cardiac defects. Regular assessment of systemic (tricuspid) atrioventricular valve regurgitation by serial echocar- diographic studies and systemic ventricular function by MRI (preferably) should be performed. Holter recording may be useful if paroxysmal atrial ar- rhythmias or transient complete AV block is suspected. Endocarditis recommendations • Unoperated CCTGA with associated left atrioventricular valve regurgita- tion, subPS or VSD should observe endocarditis prophylaxis for life. • Patients who have undergone classic repair with residual lesions, prosthetic LAVV or double switch should practice SBE prophylaxis for life. Exercise • In the absence of severe pulmonary hypertension or cardiomegaly, patients with CCTGA should restrict their activities to class 1A types. 110 Chapter 13 • Patients with severe cardiomegaly or severe pulmonary hypertension should not exercise. Pregnancy Pregnancy may be associated with a marked deterioration in systemic right ventricular function and/or the development or worsening of systemic (tri- cuspid) AV valve regurgitation. Moderate to severe systemic ventricular dys- function as well as the presence of cyanosis prepartum increases maternal morbidity and fetal losses. Close supervision of such pregnant patients is rec- ommended. Key clinical points • Left AV valve replacement should be performed before systemic right ven- tricular function deteriorates, namely at an ejection fraction ≥45%. • Left AV valve repair is usually unsuccessful because of the abnormal, often ‘Ebstein-like’, anatomy of the valve. Further reading Transposition of the great arteries Chang AC, Wernovsky G, Wessel DL, et al. (1992) Su rgica l management of late r ight vent ric u- lar failure after Mustard or Senning repair. Circulation, 86, 140–149. Flinn CJ, Wolff GS, Dick M, et al. (1984) Cardiac rhythm after the Mustard operation for com- plete transposition of the great arteries. New England Journal of Medicine, 310, 1635–1638. Gelatt M, Hamilton RM, McBride BW, et al. (1997) Arrhythmia and mortality after the Mus- tard procedure: a 30-year single-centre experience. Journal of the American College of Car- diology, 29, 194–201. Gewillig M, Cullen S, Mertens B, Lesaffre E & Deanfi eld J (1991) Risk factors for arrhythmia and death after Mustard operation for simple transposition of the great arteries. Circula- tion, 84, 187–192. Helvind MH, McCarthy JF, Imamura M, et al. (1998) Ventricular-arterial discordance: switch- ing the morphologically left ventricle into the systemic circulation after 3 months of age. European Journal of Cardiothoracic Surgery, 14, 173–178. Kanter J, Papagiannis J, Carboi MP, Ungerleider RM, Sanders WE & Wharton JM (2000) Ra- diofrequency catheter ablation of supraventricular tachycardia substrates after Mustard and Senning operations for d-transposition of the great arteries. Journal of the American College of Cardiology, 35, 428–441. Puley G, Siu S, Connelly M, et al. (1999) Arrhythmia and survival in patients >18 years of age after the Mustard procedure for complete transposition of the great arteries. American Journal of Cardiology, 83, 1080–1084. Wilson NJ, Clarkson PM, Barratt-Boyes BG, et al. (1998) Long-term outcome after the Mus- tard repair for simple transposition of the great arteries: 28-year follow-up. Journal of the American College of Cardiology, 32, 758–765. Complete Transposition of the Great Arteries 111 Congenitally corrected transposition of the great arteries Connelly MS, Liu PP, Williams WG, Webb GD, Robertson P & McLaughlin PR (1996) Con- genitally corrected transposition of the great arteries in the adult: functional status and complications [see comments]. Journal of the American College of Cardiology, 27, 1238–1243. Imai Y (1997) Double-switch operation for congenitally corrected transposition. Advances in Cardiac Surgery, 9, 65–86. Presbitero P, Somerville J, Rabajoli F, Stone S & Conte MR (1995) Corrected transposition of the great arteries without associated defects in adult patients: clinical profi le and follow up. British Heart Journal, 74, 57–59. Prieto LR, Hordof AJ, Secic M, Rosenbaum MS & Gersony WM (1998) Progressive tricuspid valve disease in patients with congenitally corrected transposition of the great arteries. Circulation, 98, 997–1005. van Son JA, Danielson GK, Huhta JC, et al. (1995) Late results of systemic atrioventricular valve replacement in corrected transposition. Journal of Thoracic and Cardiovascular Sur- gery, 109, 642–652; discussion 652–653. Van Praagh R, Papagiannis J, Grunenfelder J, Bartram U & Martanovic P (1998) Pathologic anatomy of corrected transposition of the great arteries: medical and surgical implica- tions. American Heart Journal, 135, 772–785. Voskuil M, Hazekamp MG, Kroft LJ, et al. (1999) Postsurgical course of patients with con- genitally corrected transposition of the great arteries. American Journal of Cardiology, 83, 558–562. 112 CHAPTER 14 The Single Ventricle and Fontan Circulations Description of the lesion The Fontan surgery is a palliative procedure for individuals in whom a two- ventricular repair is not feasible, such as in tricuspid atresia, pulmonary atresia with intact ventricular septum or various types of univentricular hearts. The univentricle heart is selected as the representative defect for further discus- sion (Fig. 14.1). In this defect, usually both atrioventricular (AV) valves are connected to a single ventricular cavity (double-inlet ventricle). This main ventricle is con- nected to a rudimentary chamber through a bulboventricular foramen. One great artery arises from the ventricle and the other from the rudimentary chamber. The single ventricle is left-type in 80% of cases. Transposition of the great arteries occurs in 85% of cases with the most common form being ‘dou- ble inlet left ventricle with L-TGA’ (aorta arising from the rudimentary cham- ber). Pulmonary stenosis or atresia is present in about half the cases, providing some protection to the pulmonary vasculature. Those cases without obstruc- tion to pulmonary blood fl ow have high fl ow to the lungs. Associated lesions These include coarctation of the aorta, interrupted aortic arch and patent duc- tus arteriosus. Incidence and etiology • Single ventricle accounts for less than 1% of congenital defects. • The defects in the category of ‘single ventricle physiology’ comprise a small percentage of congenital defects, but are some of the most complex. Presentation and course in childhood Because systemic and pulmonary blood are mixed in one ventricle, cyanosis is present. The severity of cyanosis depends on pulmonary blood fl ow. • If pulmonary blood fl ow is increased, cyanosis is mild and the presentation is similar to transposition of the great arteries (TGA) with ventricular septal de- fect (VSD). Signs and symptoms of congestive heart failure may be prominent. • If pulmonary blood fl ow is reduced, cyanosis is more severe and the presen- tation is similar to tetralogy of Fallot. Adult Congenital Heart Disease: A Practical Guide Michael A. Gatzoulis, Lorna Swan, Judith Therrien, George A. Pantely Copyright © 2005 by Blackwell Publishing Ltd The Single Ventricle and Fontan Circulations 113 Right AV connection Left AV connection Normal Absent right AV connection Imperforate tricuspid valve Fig. 14.1 ‘Single ventricle physiology’. Left panel: normal heart. Middle panel: patient with absent right AV connection (also called classical tricuspid atresia). Right panel: patient with imperforate tricuspid valve. ‘Single ventricle’ denotes a heart and a circulation which is not suitable for biventricular repair. Most patients with so-called ‘single ventricle physiology’ will be considered for a Fontan type of operation. Note the necessity of an adequate atrial septal defect, as there is no direct communication of the right atrium (and the systemic venous return) to the right ventricle. AV, atrioventricular. 114 Chapter 14 Examination • If pulmonary blood fl ow is increased: – mild cyanosis; – congestive heart failure/pneumonia; – 3–4/6 systolic ejection murmur at the left sternal border; – S 3 ; – apical diastolic rumble (high fl ow through the AV valves). • If pulmonary blood fl ow is reduced: – moderate to severe cyanosis; – single S 2 ; – systolic ejection murmur at left sternal border (pulmonary stenosis). Useful investigations • EKG: unusual pattern of hypertrophy with similar appearing QRS complex across the precordium. First- or second-degree heart block may be present. • Chest radiography: either increased or decreased pulmonary blood fl ow. • Echocardiography: – two AV valves opening into a single ventricle; – rudimentary chamber; – bulboventricular foramen that may be obstructive; – transposition of the great arteries (D or L type); – obstruction of the pulmonary and/or aortic valve; – abnormalities of the AV valves; – associated defects. • MRI: – is useful for assessment of anatomy and ventricular function (Fig. 14.2). Catheter/surgical management Palliative procedures include: • a systemic to pulmonary artery (PA) shunt for severe cyanosis with associ- ated pulmonary stenosis or pulmonary atresia; • banding of the pulmonary artery if the bulboventricular foramen is not ob- structive. The Fontan surgery (Fig. 14.3) is the reparative surgery when a two-ventri- cle circulation is not possible. In this surgery, the systemic venous return is diverted to the pulmonary arteries, usually without passing through a subpul- monary ventricle. The current modifi cation is the total cavo-pulmonary con- nection (TCPC) with or without a fenestration. This consists of the following. • An end-to-side anastomosis of the superior vena cava (SVC) to the top of the right PA (bidirectional Glenn, Fig. 14.3); fl ow from the SVC is directed toward the right PA. The Single Ventricle and Fontan Circulations 115 • An end-to-side anastomosis of the cardiac end of the SVC to the underside of the right PA, but offset slightly from the SVC to right PA anastomosis to direct fl ow toward the left PA. • A tubular conduit from the orifi ce of the IVC to the orifi ce of the SVC. The conduit can be placed extracardiac (Fig. 14.3) or intracardiac (within the right atrium). This can be performed as a single or two-stage procedure. If staged, a bidi- rectional Glenn anastomosis is performed fi rst, followed by completion of the Fontan. The advantages of the Fontan procedure are normal or near-normal arterial oxygen content and removal of the volume overload of the single ven- tricle. The following preoperative criteria identify individuals who do well after surgery. • Mean pulmonary artery pressure ≤15 mmHg. • Pulmonary vascular resistance ≤4 units/m 2 . • Ratio of pulmonary artery/aorta diameter ≥0.75 without distortion or nar- rowing of the pulmonary arteries. • Systemic ventricular ejection fraction ≥60% and ventricular end-diastolic pressure ≤12 mmHg. • Systemic valve regurgitation not greater than mild. Individuals who meet these criteria have an 81% survival over 10 years. Sur- vival falls to 60–70%, however, when one or more of these criteria are not met. In individuals judged at higher surgical risk, a fenestration, 4–6 mm hole in the conduit is added. This prevents excessive elevations of right atrial pressure Fig. 14.2 ‘Single ventricle physiology’ in a patient with double inlet left ventricle (cardiac MRI). Note anterior aorta (top left part of fi gure) arising from a rudimentary pouch-like anterior right ventricle. Main ventricle with smooth trabeculations dilated and posteriorly placed (right bottom part of fi gure) of left ventricular morphology. Smaller pulmonary trunk behind the aorta due to valvar and subvalvar pulmonary stenosis. [...]... alpha-1-antitrypsin (A-1-AT) The 5- year survival after diagnosis is about 50 % Diagnosis is established by documenting increased A-1-AT clearance with a 24-hour stool collection and a blood sample Hypoalbuminemia and lymphopenia are associated abnormalities No treatment is universally effective, but the best success in treating PLE is to find a reversible cardiovascular abnormality Therapies include high-protein... hypoplastic or stenotic RA, right atrium; RV, right ventricle; LV, left ventricle 1 25 126 Chapter 15 Incidence and etiology • Tetralogy of Fallot is the most common form of cyanotic congenital heart disease after 1 year of age with an incidence approaching 10% of all forms of congenital heart disease • Approximately 15% of patients with tetralogy of Fallot have a deletion of chromosome 22q11 Presentation... increased volume load of pregnancy may lead to right heart failure and arrhythmias • All patients with tetralogy should have pre-conception cardiology counseling and follow-up by an adult congenital heart disease cardiologist during pregnancy Pre-conception assessment of 22q11 deletion syndrome using fluorescent in situ hybridization (FISH) is recommended Long-term outcome • The overall survival of patients... Surgery, 119, 340–346 Adult Congenital Heart Disease: A Practical Guide Michael A Gatzoulis, Lorna Swan, Judith Therrien, George A Pantely Copyright © 20 05 by Blackwell Publishing Ltd CHAPTER 15 Tetralogy of Fallot and Right Ventricular Outflow Tract Disorders Description of the lesion The defect is due to antero-cephalad deviation of the outlet septum resulting in four features (see Fig 15. 1): • a nonrestrictive... Cardiology Clinics, 20, 3 95 4 05 Vliegen HW, van Strated A, de Roos A, et al (2003) Magnetic resonance imaging to assess the hemodynamic effects of pulmonary valve replacement in adults late after repair of Tetralogy of Fallot Circulation, 106, 1703–1707 Adult Congenital Heart Disease: A Practical Guide Michael A Gatzoulis, Lorna Swan, Judith Therrien, George A Pantely Copyright © 20 05 by Blackwell Publishing... Long-term results of total repair of tetralogy of Fallot in adulthood: 35 years follow-up in 104 patients corrected at the age of 18 or older Thoracic and Cardiovascular Surgeon, 45, 178–181 Nollert G, Fischlein T, Bouterwek S, Bohmer C, Klinner W & Reichart B (1997) Long-term survival in patients with repair of tetralogy of Fallot: 36-year follow-up of 490 survivors of the first year after surgical repair... atrial septal defect occlusion device Earlier versions of the Fontan procedure likely to be seen in adults include: • direct right atrial appendage-to-pulmonary artery connection; • formation of a lateral tunnel within the right atrium (Fig 14.4) Late complications The complexity of congenital heart disease and the surgical procedure combined with the physiology of passive flow through the pulmonary... for sudden cardiac death in adults late after repair of tetralogy of Fallot Journal of the American College of Cardiology, 40, 16 75 1680 Murphy JG, Gersh BJ, Mair DD, et al (1993) Long-term outcome in patients undergoing surgical repair of tetralogy of Fallot [see comments] New England Journal of Medicine, 329, 59 3 59 9 Nollert G, Fischlein T, Bouterwek S, et al (1997) Long-term results of total repair... with dyspnea and minimal cyanosis, the so-called ‘pink tetralogy’ or ‘acyanotic Fallot’ Most children, however, have significant RVOT obstruction with consequent right-to-left shunt and cyanosis Surgical management • Palliative procedures (to increase pulmonary blood flow): – Blalock-Taussig shunt (classic or modified – subclavian artery to pulmonary artery end-to-side shunt or interposition graft); – Waterston... follow-up series varies between 0 .5 6% over 30 years, accounting for approximately one-third to one-half of late deaths Physical examination • Repaired: parasternal right ventricular lift from right ventricular dilatation, a normal S1, but a soft and delayed P2 with a low-pitched diastolic murmur from pulmonary regurgitation at the left sternal border A systolic ejection murmur from RVOTO, a high-pitched . stool levels of alpha-1-antitrypsin (A-1-AT). The 5- year survival after di- agnosis is about 50 %. Diagnosis is established by documenting increased A-1-AT clearance with a 24-hour stool collection. follow-up Regular follow-up by physicians with special expertise in adult congenital heart disease is recommended. • Atrial switch: serial follow-up of systemic right ventricular function is war- ranted Barratt-Boyes BG, et al. (1998) Long-term outcome after the Mus- tard repair for simple transposition of the great arteries: 28-year follow-up. Journal of the American College of Cardiology, 32, 758 –7 65. Complete